About the Su-35:
The Sukhoi Su-35 is a Russian fighter aircraft. It was developed to counter
the US F-15 and F-16. Following flight tests from 1988, based on the 1985 experimental
T10-24, the first prototype was publicly displayed in 1992 at the Farnborough
Air Show.

About the Su-37:
The Sukhoi Su-37 Terminator (NATO designation: Flanker-F) is a Russian multi-role
jet fighter aircraft. It is a single-seat, all-weather, fighter and ground attack
prototype aircraft, derived from the Sukhoi Su-27. The Su-27 is a successful
Soviet fourth generation jet aircraft that has been exported to several nations,
such as China. The Su-37 test aircraft made its maiden flight in April 1996
from the Zhukovsky flight testing center near Moscow.